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Dehydration processes in borate minerals: pentahydroborite and nifontovite from Fuka Mine, Okayama Prefecture, Japan

Published online by Cambridge University Press:  05 July 2018

V. Bermanec*
Affiliation:
Institute of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac 95, 10000 Zagreb, Croatia
N. Tomašić
Affiliation:
Institute of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac 95, 10000 Zagreb, Croatia
Ž. Žigovečki Gobac
Affiliation:
Institute of Mineralogy and Petrology, Department of Geology, Faculty of Science, University of Zagreb, Horvatovac 95, 10000 Zagreb, Croatia
M. Rajić Linarić
Affiliation:
Pliva, HR-10000 Zagreb, Croatia
K. Furić
Affiliation:
Molecular Physics Laboratory, Rudjer Bošković Institute, Bijenička cesta 54, POB 180, HR-10002 Zagreb, Croatia
*

Abstract

Data on the dehydration of pentahydroborite, CaB2O(OH)6·2H2O and nifontovite, Ca3B6O6(OH)12·2H2O from the Fuka mine, Japan are presented. Critical temperatures of the dehydration of the borates were determined by thermogravimetric analysis/differential thermal analysis measurements. The untreated mineral samples and their heating products were investigated by X-ray diffraction and Raman spectroscopy. Upon dehydration, both minerals decompose and undergo amorphization, and at greater temperatures crystallize as an orthorhombic calcium borate, CaB2O4 (Pnca). The dehydration paths of the two minerals are different, with nifontovite showing a greater resistance to decomposition and amorphization than pentahydroborite. Differences in the dehydration processes are related to the residuals of the water content and structural accommodation of the borate polyanion.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2010

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References

Altomare, A., Caliandro, R., Camalli, M., Cuocci, C., Giacovazzo, C., Moliterni, A.G.G. and Rizzi R. (2004) Automatic structure determination from powder data with EXPO2004. Journal of Applied Crystallography, 37, 10251028.CrossRefGoogle Scholar
Bermanec, V., Furić, K., Rajić Linarić, M. and Kniewald, G. (2003) Thermal stability and vibra-tional spectra of the sheet borate tuzlaite NaCa[B5O8(OH)2]-3H2O. American Mineralogist, 88, 271276.CrossRefGoogle Scholar
Egorov-Tismenko, Yu.K., Baryshnikov, Yu.M., Shashkin, D.P., Simonov, M.A., and Belov, N.V. (1973a) Crystal structure of pentahydroborite CaB2O4-5H2O=Ca[B2O(OH)6]-2H2O. Doklady Akademii Nauk SSSR, 208, 10821085.(in Russian).Google Scholar
Egorov-Tismenko, Yu.K., Simonov, M.A. and Belov, N.V. (1973b) Crystal structure of nifontovite Ca3[B3O3(OH)6]2-2H2O, a natural calcium metabo-rate. Doklady Akademii Nauk SSSR, 210, 678681.(in Russian).Google Scholar
Fujiwara, T., Takada, M., Masutomi, K., Isobe, T., Okada, H., Nakai, I. and Nagashima, K. (1982) Pentahydroborite from Fuka, Okayama Prefecture, Japan. Chigaku Kenkyu (Geoscience Magazine), 33, 1120.(in Japanese).Google Scholar
Hawthorne, F.C., Pinch, W.W. and Pough, F.H. (2005) Nifontovite: From Charcas, San Luis Potosi, Mexico. Mineralogical Record, 36, 375376.Google Scholar
ICDD Powder Diffraction File (2004) Database Sets 1-54. International Centre for Diffraction Data (ICDD), Newtown Square, Pennsylvania, USA.Google Scholar
Kusachi, I. and Henmi, C. (1994) Nifontovite and olshanskyte from Fuka, Okayama Prefecture, Japan. Mineralogical Magazine, 58, 279284.CrossRefGoogle Scholar
Kusachi, I., Kobayashi, S., Tanabe, M., Kishi, S. and Yamakawa, J. (2004) Inyoite from Fuka, Okayama Prefecture. Japanese Journal of Mineralogical and Petrological Sciences, 99, 6771.CrossRefGoogle Scholar
Lisitsyn, A.E., Malinko, S.V. and Rumiantsev, G.S. (1965) Recent finds of frolovite and pentahydrobor-ite. Doklady Akademii Nauk SSSR, 164, 171173.(in Russian).Google Scholar
Malinko, S.V. (1961) New boron minerals — uralborite and pentahydroborite. Zapisi Vserossiskoga Mineralogicheskoga Obshchestva, 90, 673681.(in Russian).Google Scholar
Malinko, S.V. and Lisitsyn, A.E. (1961) A new boron mineral, nifontovite. Doklady Akademia Nauk SSSR, 139, 188190.(in Russian).Google Scholar
Omae, A., Kusachi, I. and Kobayashi, S. (2002) Petrology of the igneous rocks forming high-temperature skarns at Fuka, Okayama Prefecture. Japanese Magazine of Mineralogical and Petrological Sciences, 31, 114.CrossRefGoogle Scholar
Silins, E., Schwarz, E. and Ozolins, G. (1981) Classification and crystal-chemical role of molecular water in borates. Zhurnal Strukturnoi Khirnii (Journal of Structural Chemistry), 22, 414428.Google Scholar
Takada, M., Kushachi, I., Kishi, S., Tanabe, M. and Yasuda, T. (2005) Crystal forms of borate minerals from the Fuka mine, Okayama Prefecture, Japan. Japanese Magazine of Mineralogical and Petrological Sciences, 34, 252260.(in Japanese).CrossRefGoogle Scholar
Tunç, M., Ersahan, H., Yapici, S. and Çolak, S. (1997) Dehydration kinetics of ulexite from thermogravi-metric data. Journal of Thermal Analysis, 48, 403411.Google Scholar
Waclawska, I. (1998) Controlled rate thermal analysis of hydrated borates. Journal of Thermal Analysis, 53, 519532.CrossRefGoogle Scholar